No the Fangshi isn't silent unless you lube it. If you lube it it (from my experience) turns slow and gummy and disgusting. Otherwise it's actually rather loud. I may be lubing it wrong or something though.
rj, do you have the Gans? If so how is it?
Also the if you want silent, I would consider the ShengShou Aurora, but I think the Weilong is a better overall cube if you like fast.